(19)
(11) EP 2 416 477 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.2017 Bulletin 2017/25

(43) Date of publication A2:
08.02.2012 Bulletin 2012/06

(21) Application number: 11001094.9

(22) Date of filing: 10.02.2011
(51) International Patent Classification (IPC): 
H02M 1/42(2007.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 20.07.2010 CN 201010234958

(71) Applicant: Delta Electronics, Inc.
Taoyuan Sien 333, Taiwan (CN)

(72) Inventors:
  • Tang, Pak-Chuen
    Hong-Kong (CN)
  • Ching, Kwong-Ming
    Hong-Kong (CN)
  • Poon, Chung-Hei
    Hong-Kong (CN)

(74) Representative: Uexküll & Stolberg 
Partnerschaft von Patent- und Rechtsanwälten mbB Beselerstraße 4
22607 Hamburg
22607 Hamburg (DE)

   


(54) AD-DC converter and control circuit thereof


(57) The invention discloses a control circuit for an AC-DC converter. The control circuit includes a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, in which the frequency modulation control signal is used to control the output power of the AC-DC converter and suppress harmonics of the input current, and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, in which the frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing harmonics of the input current and regulating the switching frequency the AC-DC converter, and regulating the output power of the AC-DC converter.







Search report









Search report